On the Twelfth Day of DregNog, Laser Orgy gave to thee: the mother lode of silly Batman Christmas clips.

The Dark Knight Before Christmas (2008)

The Joker Blogs
gave us this little doozy last year, but it still gets the job done. In
it, the Joker (of the "Why so serious?" persuasion) exposes an imposter
vigilante Santa, and takes the opportunity to deliver a heartwarming
Yuletide message about the true spirit of Christmas: total anarchy.